Process of making calcium peroxid.



UNITED STAKES PATENT OFFICE.

OTTO LIEBKNECHT, 'OF FRANKFORT-ON-THE-MAIN, GERMANY, ASSlGNOR- 2T0THE-ROE SSLER & HASSLACHER CHEMICAL COMPANY, 'OF NEW YORK,

N. Y., A-OORPORATION OF NEW YORK. f

Noise-7,670.

- subject of the German Emperor, and a resident ofFrankfort-on-the-Main, Germany, have invented a certain new and usefulProcess of Making Calcium Peroxid, of which the following is aspecification.

One Way of obtaining calcium peroxid has been to treat lime-water withhydrogen peroxid. This processis of course not a technical one, as limeis but slightly'soluble' in water. Another way of making this peroxi dcomprises the treating of hydrates of sodium dioxid with hydrate ofcalcium; but this process requires-the reparation of hydrate of sodiumperoxid, which is very expensive.

I have discovered a new method whereby calcium peroxid is readily andpractically produced and which is based on the following principles:Solutions of calcium saltsas,

' for instance, calcium chloridar'e not, precipitated by ammonia.Further, calcium oxid is dissolved in solutions of ammonium saltsas, forinstance, chlorid of ammonia setting free atthe same time amrnonia, be-

cause oXid of calcium is a stronger base than ammonia.v Now if hydrogenperoxid is added to an ammoniacal solution of calcium chlorid,calcium-p'eroxid hydrate is precipitated in fine crystals. If molecularpropor tions are taken, an amount of calciumer- I oxid hydrate (CaO +8HO) correspon 'ng to the quantity of hydrogen-peroxid solution used isobtained. Of course the process may be changed by giving an ammoniacalhydrogen-peroxid solution to a solution of calcium chlorid or by makinga solution containing chlorid of calcium and. hydrogen 'peroxidammoniacal.

bound on a weak 4 Further, oxidof lime is soluble ii -sugar or glycerinunder formation of strongalkaline reacting compounds. If neutral oralkaline solutions of hydrogen peroxid are treated withsuch alkalinesolutions of calcium compounds, calcium peroxid is precipitated in*crystalline form. In all these cases the calcium radical is either suchas glycerin or sugar, have to be considered, or the reaction of thestrongacid. on which the calcium is bound is weakened by another baseas,for instance, ammonia but which cannot precipitate the calcium.

Specification of. Letters Patent. Application filed June a, 1906. SerialNo. 320.691.

peroxid in ice and water .solved in water, elevenacid, as' whichalcohols,-

PRocEs's-oFimAKme. CALCIUM PEROXID.I

Patented March 19, 1967.

The calcium oxid is in'a latent state, out of 1n each of the instancesstated the solution is such as to prevent the precipitation of calciumoxid before its reaction with the hydrogen peroxid. .l

The following examples illustrate some ways ofcarrying out my process:

First. Four hundred and fifty parts of crystallized calcium chlorid aredissolved in water. To this is added an ammoniacal "solution of hydrogenperoxid, which is obtainedby enter-v ing one hundred and sixty parts ofsodium and adding to it one hundred and fifteen parts of ammonium chlorid. peroxid, about one hundred and fifty cubic centimeters ofconcentrated ammonia solution are added. During the entire operationcaremust be taken that the temperature remains low, which can be easily doneby addingice to the liquor from time to time, as required. It ispreferable 'to stir during the operation. The precipitate is thenfiltered off, washed, and dried in the air: In this way four hundredparts of pure crystallized calcium-peroxid hydrate are obtained; Bydrying the crystals further the calcium-peroxid hydrate can betransformed into calcium peroxid'.

' Second. Eighty parts of sugar are .dis-

parts of slaked lime are added, and the mixture shaken until the lime isdissolved. To this solution, after having been filtered, if necessary, aneutral ammoniacal or alkaline solution of hydrogen In order toprecipitate all the calcium peroxid is added, whereby the calciumer Ioxid hydrate is precipitated, which is t en treated as above.

use such large quantities of chlorid of ammonia or sugar a's'mentionedin the example,

as they can 'beregained during the process,

. Of course it is understood that it is not necessary n a continuous runto as willbe seen from the following equations:

1.; 'Na O, 215111 01 H 0; 2NaCl +gNH 3. VZNILC] Na,,0

TOO

H O ZNaCl 2NH I It is the sameway with sugar. i

2. A process of making calcium peroxid consisting in reacting hydrogenperoz'nd with calcium salts m an anunomacal solution.

In witness whereof I have hereunto signed 15 my name in the presenceo'l' two subscribingwitnesses.

()TTO LI EB KN EC] IT.

Witnesses:

llonsu ZIEGLER, J EAN GRUND.

